Datasheet MM74C925, MM74C926, MM74C927, MM74C928 (Fairchild) - 5
| Manufacturer | Fairchild |
| Description | 4-Digit Counters with Multiplexed 7-Segment Output Drivers |
| Pages / Page | 9 / 5 — MM74C925. AC Electrical Characteristics. Symbol. Parameter. Conditions. … |
| File Format / Size | PDF / 112 Kb |
| Document Language | English |
MM74C925. AC Electrical Characteristics. Symbol. Parameter. Conditions. Min. Typ. Max. Units. • MM74C926. • MM74C927. • MM74C928. Note 3:
Model Line for this Datasheet
Text Version of Document
MM74C925 AC Electrical Characteristics
(Note 3) TA = 25°C, CL = 50 pF, unless otherwise noted
Symbol Parameter Conditions Min Typ Max Units
fMAX Maximum Clock Frequency VCC = 5V, Tj = 25°C 2 4 MHz Square Wave Clock Tj = 100°C 1.5 3 MHz
• MM74C926
tr, tf Maximum Clock Rise or Fall Time VCC = 5V 15 µs tWR Reset Pulse Width VCC = 5V Tj = 25°C 250 100 ns Tj = 100°C 320 125 ns tWLE Latch Enable Pulse Width VCC = 5V Tj = 25°C 250 100 ns Tj = 100°C 320 125 ns tSET(CK, LE) Clock to Latch Enable Set-Up Time VCC = 5V Tj = 25°C 2500 1250 ns
• MM74C927
Tj = 100°C 3200 1600 ns tLR Latch Enable to Reset Wait Time VCC = 5V Tj = 25°C 0 −100 ns Tj = 100°C 0 −100 ns tSET(R, LE) Reset to Latch Enable Set-Up Time VCC = 5V Tj = 25°C 320 160 ns Tj = 100°C 400 200 ns fMUX Multiplexing Output Frequency VCC = 5V 1000 Hz CIN Input Capacitance Any Input (Note 4) 5 pF
• MM74C928 Note 3:
AC Parameters are guaranteed by DC correlated testing.
Note 4:
Capacitance is guaranteed by periodic testing.
Typical Performance Characteristics Typical Segment Current Maximum Power Dissipation vs Output Voltage vs Ambient Temperature Note:
VD = Voltage across digit driver
Typical Average Segment Current vs Segment Resistor Value
5 www.fairchildsemi.com
(Note 3) TA = 25°C, CL = 50 pF, unless otherwise noted
Symbol Parameter Conditions Min Typ Max Units
fMAX Maximum Clock Frequency VCC = 5V, Tj = 25°C 2 4 MHz Square Wave Clock Tj = 100°C 1.5 3 MHz
• MM74C926
tr, tf Maximum Clock Rise or Fall Time VCC = 5V 15 µs tWR Reset Pulse Width VCC = 5V Tj = 25°C 250 100 ns Tj = 100°C 320 125 ns tWLE Latch Enable Pulse Width VCC = 5V Tj = 25°C 250 100 ns Tj = 100°C 320 125 ns tSET(CK, LE) Clock to Latch Enable Set-Up Time VCC = 5V Tj = 25°C 2500 1250 ns
• MM74C927
Tj = 100°C 3200 1600 ns tLR Latch Enable to Reset Wait Time VCC = 5V Tj = 25°C 0 −100 ns Tj = 100°C 0 −100 ns tSET(R, LE) Reset to Latch Enable Set-Up Time VCC = 5V Tj = 25°C 320 160 ns Tj = 100°C 400 200 ns fMUX Multiplexing Output Frequency VCC = 5V 1000 Hz CIN Input Capacitance Any Input (Note 4) 5 pF
• MM74C928 Note 3:
AC Parameters are guaranteed by DC correlated testing.
Note 4:
Capacitance is guaranteed by periodic testing.
Typical Performance Characteristics Typical Segment Current Maximum Power Dissipation vs Output Voltage vs Ambient Temperature Note:
VD = Voltage across digit driver
Typical Average Segment Current vs Segment Resistor Value
5 www.fairchildsemi.com
